ARM: STi: DT: STiH410: Add STiH410 SoC and b2120 board support.

The STiH410 is an advanced multi-HD AVC processor with 3D graphics acceleration
and 1.5-GHz ARM Cortex-A9 SMP CPU part of the stih407 family.

It has wide connectivity including USB 3.0, PCI-e, SATA and gigabit ethernet.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>